Windows 10 Search not finding certain file NAMES; indexing on OK, - Microsoft Community

here symptom:

1. when searching folder given filename (made of numbers, in case, type .pdf, eg: "985634701.pdf"), search returns "no results found". 
2. this true whether search performed in search box in explorer, or on start menu (cortana box).
3. if filename changed adding random string (e.g.; "test" or "x", in "985634701x.pdf"), within seconds file appear in search results.
4. if filename changed original name, disappear results.

the indexing service running, , on automatic start. a-ok.

the drive has been re-indexed.  files not found found ok.  files added folder may or may not found in search. when not found, above renaming test effects described.

have tried moving folder desktop documents folder, no change in behavior noted.

it preferable not have rename files have them found search. prefer know causing aberrant behavior , fix it.

information problem , solution gratefully welcome. 

***post moved moderator appropriate forum category.***

hi mike,

since you're having issues searching files on computer, recommend rebuild windows search index , check if issue persists. may refer steps below verify indexed locations:

1. go control panel.
2. find section labeled indexing options.
3. in indexing options window, make sure windows indexing location of files.
4. click modify button see list of locations in computer.
5. find folder contains files indexed.
6. check box.
7. click ok.

to rebuild windows search index, follow steps below:

1. go control panel.
2. click on indexing options.
3. click the advanced button , make sure you're on index settings tab of advanced options windows.
4. under troubleshooting section, click rebuild button.
5. click ok accept warning , start re-indexing process.

do update outcome , if need further assistance.

regards.

Windows / Windows 10 / Cortana & search / PC